Some ragdolls causes this strange bug, i thought it would be something in custom ragdolls but i've tested on g-man as on following screenshots:

http://uppix.com/f-hl2_2013_10_13_2525b43160014400d.png
http://uppix.com/f-hl2_2013_10_13_2525b430f0014400c.png
http://uppix.com/f-hl2_2013_10_13_2525b431c0014400e.png

It appears that I can move the ragdoll but the hands and feet bones still on the original position. I've tried to pose them with this bug but it is a pain in the a**. I've tried deleting the .gma file and redownloading it but still the same thing. Anyone know the source of this bug or any kind of clue about what may cause it?